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3 questions, Iroc wheels and 4th gen rears

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Old Sep 19, 2002 | 10:09 PM
  #1  
1986z28's Avatar
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From: Frederick, MD
Car: 86 z28, 87 IROC, 88 sc, 93 z28
Engine: LG4, LB9, LO3, LT1
Transmission: 700r4, T5, 700r4, 4L60
Axle/Gears: 3.73, 3.45, 2.73, 3.42
3 questions, Iroc wheels and 4th gen rears

3 questions:

What is the back-spacing on front iroc wheels?

&

Im planing on putting a 4th gen rear on my car, Will a 15 inch rim fit with the disc brakes? I know it does on 3rrd gen disc posi's but does a 4th gen have bigger roters?

&

I have to go back to the junk yard to look at the tag but is a lt1 with a 5 speed what gears might this rear have?

Thanks for any help!!!!!
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Old Sep 19, 2002 | 10:21 PM
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mystikkal_69's Avatar
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From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
lt1 as far as i know never came with a t-5 (aka 5 speed). they came with a t-56 (aka M6,6 speed). the fourthgen rear brakes are essentially the same(LT1 Cars) as thirdgen 89+ setup(minor differences). exception being the parking brake mechanism. the rear is 1.5" wider on each side. i myself am going to attempt this feat, installing a fourth gen rear in my thirdgen. 6 speeds came with 3.42's from the factory. from what i know the fronts have a less offset than the rear. the fronts might look better on the rear as opposed to the rear rims on the rear. the rear IROC rims on the rear would "stick out" too much due to the backspacing from what i have read/heard.

how the hell do you get the fourthgen e-brake to work in a thirdgen????
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Old Sep 20, 2002 | 09:08 AM
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I'm pretty sure some 6cyl 4th gens cam with the 5speed.
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Old Sep 20, 2002 | 12:35 PM
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From: San Antonio, TX
Car: 1988 IROC-Z
Engine: L98 (350 TPI)
Transmission: MD8 (700 R4) + 3.42 LS1 Rear
92,

i forgot about the damn V6's. i stand corrected. 5 speeds did come in 6 bangers.
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Old Sep 20, 2002 | 02:02 PM
  #5  
Z28ricer's Avatar
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From: Tampa, FL, USA
Car: 93 240SX
Engine: LQ9
Transmission: T56
Axle/Gears: 3.54 R200 IRS
The fronts would be the ones sticking out too much on a 4th gen rear, using the rear irocs with a 4th gen would be similar to front irocs on the rear of the car, and 93' 6 speed cars didnt get 3.42's
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Old Sep 20, 2002 | 10:01 PM
  #6  
1986z28's Avatar
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From: Frederick, MD
Car: 86 z28, 87 IROC, 88 sc, 93 z28
Engine: LG4, LB9, LO3, LT1
Transmission: 700r4, T5, 700r4, 4L60
Axle/Gears: 3.73, 3.45, 2.73, 3.42
Thanks fo rthe help! i was hoping for some 3.73's but oh well
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